JPS5937271B2 - Truck coil mechanism - Google Patents

Description

[Detailed Description of the Invention] A tracked tractor uses a recoil mechanism to maintain the track under tension and provide sufficient resilience against impact when subjected to heavy impact loads.
anism).

Such recoil mechanisms often must be replaced in the field and therefore must be accessible with field tools.

In large machines, the recoil mechanism uses very large, powerful springs that are very dangerous to handle.

For this reason, it is desirable to provide such springs with means for preloading or loading and installing such springs in the field.

Additionally, other problems exist with track support mechanisms for excavator type vehicles.

That is, since the track of such a vehicle is extremely short in height, there is little space for installing a recoil mechanism.

Therefore, it is desirable that such a mechanism be made as compact as possible.

As prior art to the present invention, US Pat. No. 24.1
No. 26, No. 2,683,064, No. 2.717,
No. 813, No. 2,887,342, No. 3.332
, No. 725, and No. 3,409,335.

None of these patents provides a satisfactory solution to the problems posed above.

Therefore, the first object of the present invention is to solve the above-mentioned problems associated with the prior art.

Another object of the present invention is to provide a recoil mechanism that can be easily assembled in the field or installed in a vehicle.

Yet another object of the present invention is to provide a recoil mechanism that can be removably mounted to a vehicle under preload.

According to the present invention, a recoil mechanism for a tracked tractor includes:
It includes a housing containing a preloaded spring for rebound.

The housing is assembled into the track assembly IJ- with the spring preloaded and is adapted to receive the bushing rod of the idler yoke.

The present invention will now be described with reference to the accompanying drawings, and with particular reference to FIG. 1, there is shown a hydraulic excavator generally indicated by the number 10, which excavator 10 has an engine, a hydraulic system and a cab. The upper frame assembly 12 includes an upper frame assembly 12.

The upper frame assembly is supported by a rocker mechanism 14 for rotation relative to the body frame 16, while the frame 16 is supported on a pair of spaced apart track assemblies 18.

Each track roller assembly includes a pair of spaced apart rails 20 and 22 that pivotally support idler cars and rollers for supporting a track 24.

The truck is an idler sprocket, that is, an idler car 2
6, the lower part of which is wrapped around a plurality of rollers 28
, and each of these rollers is journalled by two sets of suitable bearing assemblies supported by spaced apart rails 20 and 22.

The idler wheel 26 is pivoted by a suitable yoke assembly 30 having a bushing rod 32 extending to and operatively connected to a recoil mechanism, generally indicated at 36.

As seen in FIG. 2, the recoil mechanism 36 is located between the rails 20 and 22 of the track assembly.

It can also be seen that since the structure of the track assembly shown in Figure 1 is a low track shape, the superstructure can freely rotate around the vertical axis while maintaining a low profile for better machine stability. Will.

Therefore, in order to ensure a low profile of the track assembly, it is necessary to make the recoil mechanism compact.

The track roller assembly itself, as best shown in FIG. 3, includes an integral housing or frame member 38 that includes side walls interconnecting a pair of end walls 42 and 44. That is, it has a top wall 40.

Top wall 40 includes a pair of extensions 40a and 40b that extend laterally outwardly to spaced apart sight rails 20 and 22, as best shown in FIG. They are connected to each other by suitable bolts 46.

These end walls are spaced a predetermined distance apart to provide a preset tension on the spring.

End walls 42 and 44 are provided with coaxially aligned holes 48 and 50, respectively, for hooking or retaining the spring assembly within the housing.

As best illustrated in FIG. 3, the spring assembly itself includes a large compression spring 52 and a somewhat smaller compression spring 54 housed within the spring 52.

These springs are attached to a pair of seat members 56 and 58 and end wall 42.
．． ! =44.

These seat members are interconnected by suitable means such as tie rods 60.

That is, tie rod 60 is threadedly engaged with member 58 at 62 and also extends through a hole 64 in member 56 and has a nut 66 therein.

This arrangement allows the spring of the spring assembly to be actuated to compress between the end walls 42 and 44 of the housing.

Thus, in this construction, the nut 66 threaded onto the rod 60 allows the members 56 and 58 to be pulled together toward each other.

A sleeve 68 surrounds the rod 60 and serves as a stopping means and also as a guiding means for the device.

The stop means act when the end of the sleeve 68 engages each sheet member.

The sleeve is also sized to help guide the inner spring so that it does not become smeared or bent.

Seat member 56 includes an axially extending annular projection 70 that extends into bore 48 to maintain the seat position within end 42 of housing 38 .

Seat member 58 is generally cup-shaped and has a central aperture 72 for receiving the end of push rod 32.

The member 58 includes an umbrella-shaped portion having a conical portion at the outer end of the bore 74 and a bearing sleeve end cap member 7.
8 similarly shaped common ends 76 are received.

Thus, end cap 78 has an umbrella-shaped portion 76 that cooperatively engages portion 74.

This co-engagement between sleeve member 78 and seat member 58 holds the seat member in position laterally within housing 38.

Sleeve member 78 includes a sleeve bearing member 80 that guides and supports rod member 32 for sliding engagement with rod member 32 into and out of housing 38 .

It will be appreciated from the assembly of FIG. 3 that the entire assembly is preassembled into a housing and is easily installed into position between the rails of a vehicle.

As best shown in FIG.
0 and 22 and projecting downwardly, completely between the rails.

Preferably, the housing 38 is constructed so that three sides are open and only the top is closed, as shown.

Suitable guide means, such as an elongated strap member 82 and a removable bolt 84, may be provided extending across the open side to maintain and guide the spring member 52 in proper position within the housing. .

Preferred embodiments of the present invention will be summarized as follows.

1. A recoil mechanism as claimed in the preceding claims, wherein the second sheet member includes a bevel around the periphery of the cup for receiving an extension of the sleeve.

2. A recoil mechanism as claimed in claim 1, comprising guide means including a removable bar and a fixed bar extending along the open side of the housing to guide the spring in a non-bending manner.

3. The recoil mechanism according to item 2, wherein the housing is housed between a pair of sight rails.

4. A recoil mechanism according to claim 3, wherein adjustment means extend between the sheet members for adjustably compressing the spring for insertion into the housing.

5. The adjustment means includes a longitudinal rod extending between the sheet members, and means for threading one end of the rod to bias one of the sheet members relative to the other sheet member. The recoil mechanism according to item 4.

6. The recoil mechanism according to item 5, including a sleeve surrounding the rod between the sheet members.

[Brief explanation of the drawing]

FIG. 1 is a side view of an excavator incorporating the present invention. 2 is a detailed view of a portion of the track assembly of the vehicle of FIG. 1, partially cut away to show detail; FIG. 3 is a cross-sectional view of the recoil assembly of FIG. 2; FIG. FIG. 4 is a front view of the housing of the recoil assembly shown in FIG. 3.
・Idler, 30...Old, 36...
Recoil mechanism, 38...Housing, 40...
...Top wall, 42.44 ...End wall, 48.5
0...hole, 52.54...spring, 56
, 58... Sheet member, 60... Quirod, 64... Hole, 66... Nut, 68... Sleeve, 82... ...Strap, 84...Bolt.

Claims (1)

Claims: 1. A track recoil mechanism for a track assembly including a pair of spaced horizontally extending sight rails, a yoke assembly, and an idler rod; an elongated housing having a spaced apart end wall, at least one side wall, and a pair of flanges, the housing being secured between the rails by the flanges, each end wall having an opening. a first annular spring having a pilot portion positioned within one of the apertures; and a first annular spring having a pilot portion positioned within one of the apertures; a second annular spring seat having a cup-shaped portion extending toward the other side of the opening and receiving the idler rod; within the housing between the first and second spring seats; a pair of springs mounted thereon; a rod interconnecting said first and second spring seats and capable of adjusting compression of said pair of springs; and a rod for retaining said cup-shaped portion in position within said housing. A track recoil mechanism comprising means for.